From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe Subject: bcache_writeback task blocked for more ... Date: Sat, 18 Jul 2015 07:27:30 +0200 Message-ID: <55A9E3C2.4040608@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ph.de-nserver.de ([85.158.179.214]:17104 "EHLO mail-ph.de-nserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750781AbbGRF1P (ORCPT ); Sat, 18 Jul 2015 01:27:15 -0400 Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: "linux-bcache@vger.kernel.org" Cc: kent.overstreet@gmail.com, Eric Wheeler Hi List, while running bcache on 3.18.18 and having added the known patches from the list i still get blocked bcache_writeback tasks. The kernel does now show any stack trace on his own. The relevant tasks look like this: [: ~]# cat /proc/769/stack [] closure_sync+0x25/0x90 [bcache] [] read_dirty+0x31c/0x410 [bcache] [] bch_writeback_thread+0x204/0x400 [bcache] [] kthread+0xc9/0xe0 [] ret_from_fork+0x58/0x90 [] 0xffffffffffffffff [: ~]# cat /proc/769/stack [] closure_sync+0x25/0x90 [bcache] [] read_dirty+0x31c/0x410 [bcache] [] bch_writeback_thread+0x204/0x400 [bcache] [] kthread+0xc9/0xe0 [] ret_from_fork+0x58/0x90 [] 0xffffffffffffffff [: ~]# cat /proc/773/stack [] down+0x41/0x50 [] read_dirty+0x1f8/0x410 [bcache] [] bch_writeback_thread+0x204/0x400 [bcache] [] kthread+0xc9/0xe0 [] ret_from_fork+0x58/0x90 [] 0xffffffffffffffff [: ~]# cat /proc/783/stack [] closure_sync+0x25/0x90 [bcache] [] read_dirty+0x31c/0x410 [bcache] [] bch_writeback_thread+0x204/0x400 [bcache] [] kthread+0xc9/0xe0 [] ret_from_fork+0x58/0x90 [] 0xffffffffffffffff Greets, Stefan